Three soybean cultivars, 'Lee-74', 'Wright', and 'RA 401', were subjected to 100% (control), 75%, and 50% of field capacity during vegetative (Vl), flowering (R2), and pod-filling (R4) stages in greenhouse and field studies. Stress applied at R2 significantly reduced the yield in the green-house, while in the field, the maximum reduction was observed when the plants were subjected to stress at R4. Stress during Vl reduced the yield components less than stress applied during R2 or R4 stages in both studies.